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Sources of contaminants in the bleac...

Dube, Monique Gaye.

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Sources of contaminants in the bleached kraft pulping process and their effect on the mummichog (Fundulus heteroclitus).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Sources of contaminants in the bleached kraft pulping process and their effect on the mummichog (Fundulus heteroclitus)./
作者:	Dube, Monique Gaye.
面頁冊數:	216 p.
附註:	Source: Dissertation Abstracts International, Volume: 62-12, Section: B, page: 5585.
Contained By:	Dissertation Abstracts International62-12B.
標題:	Environmental Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ65456
ISBN:	0612654567

Sources of contaminants in the bleached kraft pulping process and their effect on the mummichog (Fundulus heteroclitus).
Dube, Monique Gaye.

Sources of contaminants in the bleached kraft pulping process and their effect on the mummichog (Fundulus heteroclitus). - 216 p.

Source: Dissertation Abstracts International, Volume: 62-12, Section: B, page: 5585.

Thesis (Ph.D.)--The University of New Brunswick (Canada), 2000.

Resources expended by the pulp and paper industry to improve effluent quality and reduce environmental impacts have been remarkably successful during the past two decades. However, despite these efforts, reproductive-endocrine effects continue to be documented in wild fish exposed to bleached kraft pulp mill effluents (BKPME). The objectives of this research were to: identify a source of contaminants in the bleached kraft pulping process that affected the reproductive-endocrine function of the mummichog (Fundulus heteroclitus ), evaluate the effectiveness of a process change in removing this source, and to identify causative agents.

ISBN: 0612654567Subjects--Topical Terms:

676987
Environmental Sciences.

Sources of contaminants in the bleached kraft pulping process and their effect on the mummichog (Fundulus heteroclitus).
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245 1 0 $a Sources of contaminants in the bleached kraft pulping process and their effect on the mummichog (Fundulus heteroclitus).
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500 $a Source: Dissertation Abstracts International, Volume: 62-12, Section: B, page: 5585.
500 $a Adviser: Deborah MacLatchy.
502 $a Thesis (Ph.D.)--The University of New Brunswick (Canada), 2000.
520 $a Resources expended by the pulp and paper industry to improve effluent quality and reduce environmental impacts have been remarkably successful during the past two decades. However, despite these efforts, reproductive-endocrine effects continue to be documented in wild fish exposed to bleached kraft pulp mill effluents (BKPME). The objectives of this research were to: identify a source of contaminants in the bleached kraft pulping process that affected the reproductive-endocrine function of the mummichog (Fundulus heteroclitus ), evaluate the effectiveness of a process change in removing this source, and to identify causative agents.
520 $a In 1997, Fundulus heteroclitus were exposed in a mesocosm system to three process effluents from a BKPM including condensates, post-oxygen washer filtrates and combined mill effluent (CME). Exposure to condensates (1%) significantly decreased in vitro production of 17beta-estradiol in females and may have contributed to reduced plasma testosterone levels in fish exposed to CME. These results provided evidence that condensates were a potential source of compounds capable of disrupting the endocrine system in fish (endocrine disrupting compounds or EDCs). In 1998, a mesocosm study was conducted to determine if reverse osmosis (RO) treatment of condensates reduced the potential of CME to depress sex steroid levels in the mummichog. After installation of the process change, exposure to CME did not depress plasma testosterone levels at a 1% effluent concentration. In 1999, the potential role of the RO system in reducing effluent toxicity and endocrine-disrupting potential was evaluated using standard acute and sublethal toxicity tests and laboratory exposures with mummichog. The RO system eliminated acute toxicity of the final effluent and significantly reduced sublethal toxicity in the absence of secondary effluent treatment. Laboratory exposures confirmed that condensates were a source of EDCs to the mummichog, and RO was an effective process change to remove this source at an environmentally-relevant effluent concentration (1%). EDCs in the condensates were low molecular weight volatile organic compounds which were present in the absence of phytosterols and weak black liquor entrainment in the condensates.
520 $a This research provided a significant contribution to existing gaps in knowledge on the effects of BKPME on fish reproductive-endocrine function by identifying a source of EDCs within the process, potential EDCs, and a potential process option for environmental protection.
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650 4 $a Biology, Zoology. $3 1018632
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